
.dk-icon{
  display: inline-block;
  width: 18px;
  height: 18px;
  margin-right: 10px;
  background-size: cover;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
.dk-icon-school{
  background: url('../images/menu-icon/ic_nav_school.png') no-repeat center center ;
  .dk-icon();
}
.dk-icon-teacher{
  background: url('../images/menu-icon/ic_nav_teacher.png') no-repeat center center ;
  .dk-icon();
}
.dk-icon-student{
  background: url('../images/menu-icon/ic_nav_student.png') no-repeat center center ;
  .dk-icon();
}
.dk-icon-work{
  background: url('../images/menu-icon/ic_nav_work.png') no-repeat center center ;
  .dk-icon();
}

.dk-icon-score{
  background: url('../images/menu-icon/ic_nav_score.png') no-repeat center center ;
  .dk-icon();
}